A lawyer for three people charged with participating in a $100 million money laundering syndicate linked to organised crime says the group is "distressed ... about the huge allegations" levelled against them.

Gagandeep Pahwa, 30, his domestic partner Gopali Dahl, 30, and their associate Bipin Thapa, 29, were arrested by detectives from the Criminal Groups Squad on Thursday.

All three were targeted over their alleged role in using a south-west Sydney security business as a "front" to launder money in and out of the hands of organised criminals in Australia and abroad that was first believed to have handled $80 million in the space of three to four years.

Police allege the group, led by Mr Pahwa, participated in the daily operations of Assure Protection Services, on Woodville Rd, Guildford. The trio were formally refused bail in court on Friday.

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The security firm is a semi-legitimate security business that allegedly accepted cash from organised crime groups, before moving the money through additional transactions and withdrawing it to be passed back to other criminal syndicates.

Mr Pahwa and Mr Thapa appeared at Parramatta Local Court via audio-visual link, while Ms Dahl appeared via audio-visual link at Fairfield Local Court.

None of the three applied for bail, however bail was formally refused.

The trio's criminal lawyer Ejaz Khan said, despite lengthy police interviews on Thursday night, he and his clients were yet to read the full police fact sheet outlining the charges against them.

Gopali Prtha Dahl (left) is the director and sole shareholder of the company behind the security firm targeted by investigators.Credit:Facebook

"Of course they are distressed. How can they feel about such huge allegations?" he said.

"The allegations are very damning and very serious. I need to see the evidence before I can make any comment on the strength of the prosecution case."

According to court documents, all three accused have been charged with knowingly dealing with the proceeds of crime, with intent to conceal not less than $100 million.

Mr Pahwa has also been charged with knowingly directing a criminal group, while Ms Dahl and the 29-year-old-man have both been charged with participating in a criminal group contributing to criminal activity.

The three accused were taken by surprise when they were met by police on Thursday morning, with Mr Pahwa and Mr Thapa both arrested during the execution of a search warrant at the office of Assure Protection Services.

Cash seized during the raids on Thursday.Credit:NSW Police

Ms Dahl was arrested a short time later at a home in Merrylands West, where she is understood to live with Mr Pahwa.

During the raids investigators seized around $400,000 in cash, money counting machines, three vehicles and designer clothing.

Company records reveal the Assure Protection Services business name is owned by Pahwa Group of Companies Pty Ltd, of which Mr Pahwa was the director and secretary between 2016 and 2018. However since early last year Ms Dahl has been the sole company director, secretary and shareholder.

Detective Chief Inspector Nick Read described the operation as "complex" and said investigators expected to uncover further evidence of money laundering, "perhaps over a longer period. There will certainly be more arrests", he added.

Police uncovered the alleged syndicate while conducting an unrelated investigation into large-scale drug supply in south-west Sydney, with which there were "commonalities."